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Do you have one of those diamond coated disks mounted on a mandrel usually included in those rotary tool kit.You could try grinding a flat spot on the ceramic ball so you can use your center punch,but I am pretty sure there will be a point where the disk will almost stop grinding.Another option is a belt grinder with a coarse grit belt.

As for a center punch, if you have some small diameter high carbon steel drill rods like O1.If so,you could make a hardened pointed punch,provided it is hardened and tempered right should be more than plenty to pulverize that ceramic ball.Held in some vise grip.

Also have you tried smashing the ceramic balls with a large hammer and an anvil

It's true that I didn't think about the fact that abrasion resistance and impact resistance are often inverses of each other. These are, after all, the analogs of edge retention and toughness, which tend to invert when one is maximized (absolutely, not locally maximized)! In other words, duhhh; I should have thought of that.

I was told that an automatic center punch should do the trick; that's what the knifemaker I consulted with uses when this happens to him. I may use my Beast DMT diamond block to flatten out the top of the ball just a little bit to reduce the possibility of the punch rolling on to the side of the titanium scale, though

Previously I tried whacking one of those balls with a hammer, but it just sunk into the 2x4 under it (that I was using for testing purposes), and results on my kitchen counter weren't any better. The far higher PSI from a punch will likely be much more effective.

Go get a can of keyboard duster, the compressed air stuff. If you hold the can upside down and spray it, it will spray a really cold gas (like -60°). Do this, and get the ceramic ball really cold, then whack the titanium slab against something. Should come right out

I was looking at your pics again.It looks to be only 40% the way in.Your could try gripping the ball with a pair of end cut pliers.Otherwise clamp it down and try knocking it out at the scale with a slotted screwdriver and hammer

It took 5-10 minutes of smashing that little sucker, gradually wearing him away, but the punch that came from Amazon worked. (Last night I tried a cheaper, less forceful punch that I already own; it didn't work worth a damn. This $10 tool from Amazon was the perfect tool for the job.) The saga is over!